drivers/common/sfc_efx/base/rhead_pci.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright(c) 2019-2020 Xilinx, Inc.
   4  * Copyright(c) 2019 Solarflare Communications Inc.
   5  */
   6
   7 #include "efx.h"
   8 #include "efx_impl.h"
   9
  10 #if EFSYS_OPT_RIVERHEAD && EFSYS_OPT_PCI
  11
  12 /*
  13  * Search for a EF100 resource locator from the given offset of an entry
  14  * in a Xilinx capabilities table.
  15  */
  16 static  __checkReturn                   efx_rc_t
  17 rhead_xilinx_cap_tbl_find_ef100_locator(
  18         __in                            efsys_bar_t *esbp,
  19         __in                            efsys_dma_addr_t tbl_offset,
  20         __out                           efx_bar_region_t *ef100_ebrp)
  21 {
  22         efx_rc_t rc;
  23         efsys_dma_addr_t entry_offset = tbl_offset;
  24
  25         rc = efx_pci_xilinx_cap_tbl_find(esbp, ESE_GZ_CFGBAR_ENTRY_EF100,
  26                                            B_FALSE, &entry_offset);
  27         if (rc != 0) {
  28                 /* EF100 locator not found (ENOENT) or other error */
  29                 goto fail1;
  30         }
  31
  32         rc = rhead_nic_xilinx_cap_tbl_read_ef100_locator(esbp, entry_offset,
  33                                                          ef100_ebrp);
  34         if (rc != 0)
  35                 goto fail2;
  36
  37         return (0);
  38
  39 fail2:
  40         EFSYS_PROBE(fail2);
  41 fail1:
  42         EFSYS_PROBE1(fail1, efx_rc_t, rc);
  43
  44         return (rc);
  45 }
  46
  47         __checkReturn                   efx_rc_t
  48 rhead_pci_nic_membar_lookup(
  49         __in                            efsys_pci_config_t *espcp,
  50         __out                           efx_bar_region_t *ebrp)
  51 {
  52         boolean_t xilinx_tbl_found = B_FALSE;
  53         unsigned int xilinx_tbl_bar;
  54         efsys_dma_addr_t xilinx_tbl_offset;
  55         size_t pci_capa_offset = 0;
  56         boolean_t bar_found = B_FALSE;
  57         efx_rc_t rc = ENOENT;
  58         efsys_bar_t xil_eb;
  59
  60         /*
  61          * SF-119689-TC Riverhead Host Interface section 4.2.2. describes
  62          * the following discovery steps.
  63          */
  64         while (1) {
  65                 rc = efx_pci_find_next_xilinx_cap_table(espcp, &pci_capa_offset,
  66                                                         &xilinx_tbl_bar,
  67                                                         &xilinx_tbl_offset);
  68                 if (rc != 0) {
  69                         /*
  70                          * SF-119689-TC Riverhead Host Interface section 4.2.2.
  71                          * defines the following fallbacks for the memory bar
  72                          * and the offset when no Xilinx capabilities table is
  73                          * found.
  74                          */
  75                         if (rc == ENOENT && xilinx_tbl_found == B_FALSE) {
  76                                 ebrp->ebr_type = EFX_BAR_TYPE_MEM;
  77                                 ebrp->ebr_index = EFX_MEM_BAR_RIVERHEAD;
  78                                 ebrp->ebr_offset = 0;
  79                                 ebrp->ebr_length = 0;
  80                                 bar_found = B_TRUE;
  81                                 break;
  82                         } else {
  83                                 goto fail1;
  84                         }
  85
  86                 }
  87
  88                 xilinx_tbl_found = B_TRUE;
  89
  90                 EFSYS_PCI_FIND_MEM_BAR(espcp, xilinx_tbl_bar, &xil_eb, &rc);
  91                 if (rc != 0)
  92                         goto fail2;
  93
  94                 rc = rhead_xilinx_cap_tbl_find_ef100_locator(&xil_eb,
  95                                                              xilinx_tbl_offset,
  96                                                              ebrp);
  97                 if (rc == 0) {
  98                         /* Found valid EF100 locator. */
  99                         bar_found = B_TRUE;
 100                         break;
 101                 } else if (rc != ENOENT) {
 102                         /* Table access failed, so terminate search. */
 103                         goto fail3;
 104                 }
 105         }
 106
 107         if (bar_found == B_FALSE)
 108                 goto fail4;
 109
 110         return (0);
 111
 112 fail4:
 113         EFSYS_PROBE(fail4);
 114 fail3:
 115         EFSYS_PROBE(fail3);
 116 fail2:
 117         EFSYS_PROBE(fail2);
 118 fail1:
 119         EFSYS_PROBE1(fail1, efx_rc_t, rc);
 120
 121         return (rc);
 122 }
 123
 124 #endif /* EFSYS_OPT_RIVERHEAD && EFSYS_OPT_PCI */